Collapsible core



I. N. BOYCE.

COL'LAPSIBLE CORE.

APFLlCATlON FILED AUG.20. 1919.

Patented Nov 15, 1921 srars ATN fFlQE.

GOODYEAR TIRE &; RUBBER COM- PANY, OF AKRON, OHIO, A. CORPORATION OF OHIO.

COLLAPSIBLE CORE.

Specification of Letters Patent.

Patented Nov, 15, 1921.

Application filed August 20, 1919. Serial No. 318,715.

To all whom it may concern Be it known that I, JOHN N. BOYCE, a citizen of the United States, and resident of Akron, Summit county, Ohio, have invented new and useful Improvements in Collapsible Cores, of which the following is a specification.

The present invention relates to improvements in collapsible cores used in the manufacture of pneumatic tire casings, the principal object of the invention being the provision of novel devices for assembling and holding in assembled annular relation the several sections of which the core is composed, the devices being simple in operation and insuring perfect and rigid alinement of the core when assembled, and the reverse operation of the devices readily collapsing the core for its removal from the interior of the finished tire casing.

The above and additional objects of a similar nature, which, will be hereinafter more specifically treated, may be accomplished by such means as are illustrated in the accompanying drawings, described in the following specification and then more particularly pointed out in the claims which are appended hereto and form a part of this application.

With reference to the drawings, wherein there has been illustrated a preferred embodiment of the invention, and throughout the several views of which similar reference numbers designate corresponding parts:

Figure 1 is a side elevation of one half of a core with the sections in assembled position;

F ig. 2 is a fragmentary longitudinal section on an enlarged scale showing contiguous ends of two core sections in locked relation;

Fig. 3 is an end elevation of one of the core sections; and

Fig. 4 is an end elevation of a core section complementary to that of Fig. 3.

A ring core embodying the features of this invention consists ordinarily of a plurality of segment shaped sections, which, When united as herein described, constitute an annulus, the outer surface of which forms a configuration corresponding exactly in shape and dimensions to the inner surface of the tire casing or shoe to be constructed thereon. The sections which form a portion of the completed annular core are des ignated in the drawing by the numerals 5, 6 and 7 respectively and are adapt-ed to be arranged in end to end relation as shown in Figol of the drawing. On each of the abutting faces of the various sections of the core I provide a face plate 8, secured to the face of the section by studs 9 or their equivalent, which face plates 8 in the shorter sections of the core are provided with a key 10, which can be either secured to the face plate by screws or bolts, as shown, or made an integral part thereof. Each of the face plates on the longer sections of the core is corre- I spondingly provided with a keyway 11 into which said key 10 is designed to register when the core sections are joined in assembled relation.

In the center ofthe end face of each of the longer sections of the core, in a slot or recess 10 provided for the purpose, 1 pivotally mount at 12 a draw bolt 13 on the end of which is a nut 14 and washer 15. The slot or recess 10 preferably extends from the inner periphery of the section substantially radially of the end thereof and is de signed to house the drawbolt 10 in its idle position, the inner periphery of the section being undercut as at 10 for the reception of the nut 14 and the washer 15. In the end face of the shorter section a slot 11 is formed to exactly aline with the slot 10 in the longer section when said sections are assembled and which terminates in an abutment or shoulder 10 oblique with respect to the end of the section. When the various sections of the core are assembled and joined by means of the keys 10 registering in the keyways 11, the bolts 13 are swung over into the slots or recesses of the smaller sections of the core and the bolts 14 are tightened up against the inclined surfaces 16 formed by the configuration of the inner periphery of each shorter section.

Owing to the relative positions of the pivotal point of each bolt 13 and its cooperat ing inclined surface 16, when the nuts 14 are tightened, the contiguous ends of adjacent sections are drawn together obliquely and are slid one against the other into pe ripheralalinement, the keys 10 and key ways 11 serving to hold the sections in a common plane and to limit the relative movement of one section against the other.

In order to disassemble or collapse the core the nuts 14: are loosened to permit each bolt 13 to swing back into its recess or slots 10 in the larger section of the core towhich it is pivoted, thus permitting the sections of the core to be readily disengaged and separated one from the other. A small space or opening is left at 17 for the insertion of a prying bar or similar tool in case the sections of the core should stick together after use as an assembled unit.

What I claim is:

1. A tire forming core comprising a plurality of separate sections adapted for end to end engagement and having their engaging end faces each provided withca recess, means for registering engaging faces of said sections, a bolt pivoted in the recess of one section and adapted to swing outward into the recess of the contiguous end of the engaging section for locking engagement with said section in a position obliquewith respect to the engaging faces of said sections.

2. A tire forming core comprising separate sections adapted to be assembled in end to end relation and having their ends each provided with a recess, a slotted faceplate upon each end of each section the slot therein alining with the recess in the end of the section, a locking element pivoted in the slot of one section and swingable into the slot in the contiguous end of the adjacent section to a position oblique with respect to the contiguous ends of said sections, means upon the locking element for clamping engagement with the second section, and keyway elements complemental to contiguous faceplates for holding the sections in a common plane.

3. A collapsible ring core comprising segmental sections adapted to be juxtaposed in end to end relation and having key and keyway engagement between their juxtaposed ends for holding the sections in a common plane, and clamping means complemental to adjacent sections for sliding said sections one against the other into peripheral alinement and drawing said sections together to lock the same in their alined position.

4:. A collapsible ring core comprising segmental sections adapted to be juxtaposed in end to end relation and having key and keyway engagement between their juxtaposed ends for holding the sections in a common plane, and a pivoted element upon one section swingable into engagement with its adjacent section for sliding. said sections one against the other into peripheral alinement and drawing them together to lock the same in their alined position.

5. A collapsible ring core comprising segmental sections adapted to be juxtaposed in end to end relation, means complemental to adjacent sections for sliding one section against the other into peripheral alinement and locking them together, andkey and keyway elements between the adjacent sections for holding them in the same plane and limiting their sliding movement one against the other.

6. A collapsible ring core comprising segmental sections adapted to be juxtaposed in end to end relation, a pivoted element upon one section swingable into engagement with its adjacent section for sliding said sections one against the other into peripheral alinement and locking them together, and key and keyway elements between the adjacent sections for holding them in the same plane and limiting their sliding movement one against the. other.

7 A collapsible ring core comprising end to end engaging sections having their engaging ends provided respectively with a slot extending radially thereof from the inner periphery of the section, a drawbolt pivoted at one end in the slot of one section and swingable to project through the slot of the adjacent section, and means upon the drawbolt for clamping engagement with the inner periphery of the latter section to lock the sections together and to aline them peripherally.

8. A collapsible ring core comprising end to end engaging sections having their engaging ends provided respectively with a slot extending radially thereof from the inner periphery of the section, a pivoted drawbolt swingable from within the slot in the first section to project through the slot in the adjacent section, in a position oblique with respect to the engaging ends of said sections, and means upon the drawbolt for clamping engagement with the periphery of the latter section to lock the sections together and to aline them peripherally.

9. A collapsible ring core comprising end to end engaging sections having their engaging ends provided respectively with a slot extending radially thereof from the inner periphery of the section, a drawbolt pivoted at one end in the slot of the first section and swingable to project through the slot of the adjacent section, means upon the drawbolt for clamping engagement with the inner periphery. of the latter section to lock the sections together and aline them peripherally, and means between the ends of the engaging sections for holding them in a common plane and in peripheral alinement.

10. A collapsible ring core comprising end to end engaging sections having their engaging ends provided respectively with a slot extending radially thereof from the in ner periphery of the section, a pivoted drawbolt swingable from within the slot in the first section to project through the slot in the adjacent section 1n a position oblique with respect to the engaging ends of the sections, means upon the drawbolt for clamping engagement with the periphery of the latter section for drawing the sections together and sliding them one against the other into peripheral alinement, and means between the engaging ends of said sections for holding them in a common plane and limiting their relative sliding movement.

11. A collapsible ring core comprising end to end engaging sections having their engaging ends provided respectively with a slot extending radially thereof from the inner periphery of the section, a pivoted drawbolt swingable from within the slot of the first section to project through the slot in the adjacent section, a shoulder Within the slot in the second section for limiting the swing of the bolt to a position oblique with respect to the engaging ends of the sections, means upon the drawbolt for clamping engagement with the inner periphery of the latter section to draw said sections together and slide one against the other into peripheral alinement, and means between the engaging sections for holding them in a common plane and limiting their relative sliding movement.

12. A collapsible ring core comprising end to end engaging sections having their engaging ends provided respectively with a slot extending radially thereof from the inner periphery of the section, a pivoted drawbolt swingable from within the slot in the first section to project through the slot in the adjacent section in a position oblique with respect to the engaging ends of said sections, means upon the drawbolt for clamping engagement with the periphery of the latter section to draw said sections together and sliding one against the other into peripheral alinement, and key and keyway elements between the ends of the sections for holding them in a common plane and limiting their relative sliding movement.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

JOHN N. BOYCE. Witnesses:

L. M. HARTMAN, J. E. KEATING. 

